Implicit declaration of function 'DLog' is invalid in C99

Question

I used a macro version of NSLog from here, http://objdev.com/2014/06/debug-logging

like this,

#ifdef DEBUG
#define DLog(...) NSLog(@"%s(%p) %@", __PRETTY_FUNCTION__, self, [NSString stringWithFormat:__VA_ARGS__])
#endif

It was working fine, until I changed the app run mode from Debug to Release.

Now I get the following error:

Implicit declaration of function 'DLog' is invalid in C99.

How do I solve this?

P.S. This question isn't related to CocoaLumberjack at all.

score 19 · Accepted Answer · edited Aug 22 '16 at 09:18

19

Error tells you that DLog doesn't have any definition in Release Mode. Just change it to this:

#ifdef DEBUG
#define DLog(...) NSLog(@"%s(%p) %@", __PRETTY_FUNCTION__, self, [NSString stringWithFormat:__VA_ARGS__])
#else
#define DLog(...)
#endif

EDIT : If it is a Release mode DLog will do nothing(A Blank Function). And if it is a debug mode DLog will print the log as per your requirements.

edited Aug 22 '16 at 09:18

Mohamed Elkassas

answered Mar 24 '15 at 14:10

Nirav Gadhiya

Thanks, I just did it like this way only and it worked, one question is it proper? – Hemang Mar 24 '15 at 14:12
Yes. It is perfectly alright. If it is a Release mode DLog will do nothing(A Blank Function). And if it is a debug mode DLog will print the log as per your requirements. – Nirav Gadhiya Mar 24 '15 at 14:16
3

`DLog(@"Thanks Nirav!");` ;) – Hemang Mar 24 '15 at 14:23
DLog(@"WelCome Michael!"); – Nirav Gadhiya Mar 24 '15 at 15:49

score 0 · Answer 2 · answered Mar 24 '15 at 14:10

0

The macro is only defined when you compile your code e debug mode because of the #ifdef DEBUG directive

answered Mar 24 '15 at 14:10

2 Answers2